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serpentine groundsel, Siskiyou butterweed, western ragwort

Flett's groundsel, Flett's ragwort

Habit Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). Perennials, 10–40+ cm; rhizomatous (rhizomes horizontal to erect).
Stems

1, glabrous or sparsely tomentose.

1 or 2–5 (often scapiform), loosely clustered, glabrous or leaf axils sparsely hairy.

Basal leaves

(and proximal cauline) petiolate;

blades ovate, oblanceolate, or spatulate, 10–30 × 5–20 mm, bases tapering, sometimes obtuse, margins entire, subentire, or dentate.

(and proximal cauline) petiolate;

blades obovate to ovate or sublyrate, 30–60+ × 10–40+ mm, bases tapering, margins deeply dissected or pinnatifid, ultimate margins crenate to crenate-dentate.

Cauline leaves

abruptly reduced (sessile, clasping; bractlike, entire).

abruptly reduced or 0 (sessile; ovate to obovate, dissected or pinnatifid).

Peduncles

bracteate (bractlets red-tinged), densely lanate-tomentose.

inconspicuously bracteate or ebracteate, glabrous.

Ray florets

(8–)13;

corolla laminae 6–10+ mm.

5 or 8;

corolla laminae 5–10 mm.

Disc florets

35–50+;

corolla tubes 2.5–3.5 mm, limbs 3–4 mm.

20–30+;

corolla tubes 2.5–3.5 mm, limbs 2.5–3.5 mm.

Phyllaries

(13–)21, green (tips red or dark red), densely tomentose proximally.

(8–)13, light green (tips yellowish), 4–7 mm, glabrous.

Calyculi

conspicuous (bractlets narrow, red-tinged).

0 or inconspicuous.

Heads

1–4+ in corymbiform arrays.

4–10+ in subumbelliform cymiform arrays.

Cypselae

1.5–2 mm, glabrous;

pappi 5–6 mm.

1–1.5 mm, glabrous;

pappi 4–4.5 mm.

2n

= 46.

= 40.

Packera hesperia

Packera flettii

Phenology Flowering mid Apr–mid Jun. Flowering early Jul–mid Aug.
Habitat Serpentine derived soils, open woodland scrub Exposed slopes, rocky or gravelly soils
Elevation 500–2500 m (1600–8200 ft) 700–2000 m (2300–6600 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
OR; WA
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Packera hesperia is known only from the Siskiyou Mountains.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Packera flettii is known from the Olympic Mountains and near Mt. Rainer in Washington and coastal mountains of Clatsop County, Oregon. It has a chromosome number unique in the genus and is not known to hybridize with other species of Packera.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 20, p. 589. FNA vol. 20, p. 587.
Parent taxa Asteraceae > tribe Senecioneae > Packera Asteraceae > tribe Senecioneae > Packera
Sibling taxa
P. anonyma, P. antennariifolia, P. aurea, P. bernardina, P. bolanderi, P. breweri, P. cana, P. cardamine, P. castoreus, P. clevelandii, P. contermina, P. crocata, P. cymbalaria, P. cynthioides, P. debilis, P. dimorphophylla, P. eurycephala, P. fendleri, P. flettii, P. franciscana, P. ganderi, P. glabella, P. greenei, P. hartiana, P. hyperborealis, P. indecora, P. ionophylla, P. layneae, P. macounii, P. malmstenii, P. millefolium, P. millelobata, P. multilobata, P. musiniensis, P. neomexicana, P. obovata, P. ogotorukensis, P. pauciflora, P. paupercula, P. plattensis, P. porteri, P. pseudaurea, P. quercetorum, P. sanguisorboides, P. schweinitziana, P. spellenbergii, P. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
P. anonyma, P. antennariifolia, P. aurea, P. bernardina, P. bolanderi, P. breweri, P. cana, P. cardamine, P. castoreus, P. clevelandii, P. contermina, P. crocata, P. cymbalaria, P. cynthioides, P. debilis, P. dimorphophylla, P. eurycephala, P. fendleri, P. franciscana, P. ganderi, P. glabella, P. greenei, P. hartiana, P. hesperia, P. hyperborealis, P. indecora, P. ionophylla, P. layneae, P. macounii, P. malmstenii, P. millefolium, P. millelobata, P. multilobata, P. musiniensis, P. neomexicana, P. obovata, P. ogotorukensis, P. pauciflora, P. paupercula, P. plattensis, P. porteri, P. pseudaurea, P. quercetorum, P. sanguisorboides, P. schweinitziana, P. spellenbergii, P. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
Synonyms Senecio hesperius, Senecio auleticus Senecio flettii
Name authority (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) (Wiegand) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981)
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